使用Python comtypes库向Excel添加查询表时出现问题

Question

我正在尝试使用Python comtypes库在excel电子表格中创建一个QueryTable,但是得到一个相当无意义的错误......

在vba中(在工作簿中的模块中),以下代码可以正常工作:

Sub CreateQuery()
    Dim con As ADODB.Connection
    Dim rs As ADODB.Recordset
    Dim ws As Worksheet
    Dim qt As QueryTable

    Set ws = ActiveWorkbook.Sheets(1)

    Set con = New ADODB.Connection
    con.Open ("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Path\to\Db.mdb;")

    Set rs = New ADODB.Recordset
    rs.Open "Select * from [tbl Base Data];", con

    Set qt = ws.QueryTables.Add(rs, ws.Range("A1"))
    qt.Refresh
End Sub

但是以下Python代码:

import sys
import comtypes.client as client

def create_querytable():
    constring = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Path\\to\\Db.mdb"
    conn = client.CreateObject("ADODB.Connection", dynamic = True)
    rs = client.CreateObject("ADODB.Recordset", dynamic = True)

    SQL = "Select * from [tbl Base Data];"

    conn.Open(constring)
    rs.Open(SQL, conn)
    excel = client.CreateObject("Excel.Application", dynamic = True)
    excel.Visible = True
    ws = excel.Workbooks.Add().Sheets(1)
    qt = ws.QueryTables.Add(rs, ws.Range["A1"])
    qt.Refresh()
    rs.Close()
    conn.Close()

抛出无用的错误消息:

Traceback (most recent call last):
  File "<pyshell#34>", line 1, in <module>
    create_querytable()
  File "C:/Documents and Settings/cvmne250/Desktop/temp.py", line 17, in create_querytable
    qt = ws.QueryTables.Add(rs, ws.Range["A1"])
  File "G:\ISA\SPSS\comtypes\lib\comtypes\client\lazybind.py", line 160, in caller
  File "G:\ISA\SPSS\comtypes\lib\comtypes\automation.py", line 628, in _invoke
COMError: (-2147352567, 'Exception occurred.', (None, None, None, 0, None))

关于这里发生了什么的任何想法？

谢谢!

Answer 1

我简化了您的代码，这应该可以正常工作（我将在下面解释更改）：

def create_querytable2():
    constring = "OLEDB;Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\path\to\db.mdb;"
    SQL = "Select * from tblName;"
    excel = client.CreateObject("Excel.Application", dynamic=True)
    excel.Visible = True
    ws = excel.Workbooks.Add().Worksheets(1)
    ws.QueryTables.Add(constring, ws.Range["A1"], SQL).Refresh()

QueryTables.Add() 函数可以为您创建 Connection 和 Recordset 对象，这样就简化了很多事情...您只需在连接字符串（“OLEDB”部分）中添加连接类型即可。

让 Excel 完成大部分工作似乎可以解决您的问题:)